Donning a red non-contact jersey, Luck was seen throwing the ball during the session. Coach Chuck Pagano later confirmed that Luck remains in the concussion protocol, but said he anticipates the star quarterback suiting up against the New York Jets next Monday night.

"There's a protocol ... and I'm in it," said Luck said, who noted that he "felt good toward the end of (last) week."

Luck suffered the head injury in a Week 11 win over the Titans. Reporters weren't told of the concussion until the following day, a setback that came as an unwelcome surprise in the lead-up to the Steelers tilt.

The Colts were a semi-disaster on offense without Luck on the field. Now sitting a game behind the Titans and Texans in the AFC South, Indy (5-6) cannot afford another missed start from their most valuable player.